KR102241693B1 - Organic light emitting display device and methode of driving the same - Google Patents

Abstract

An organic light emitting diode display that divides a frame into a plurality of subfields and drives a display panel including a plurality of pixels, a scan driver providing a scan signal to the display panel, and a data signal for 2D image data or 3D image data. A data driver that generates and provides a data signal to the display panel, receives a 2D image signal at a fixed input frequency, and displays a 2D image signal in N (N is a natural number greater than 1) subfields. It converts into image data and outputs it, receives a 3D image signal at a fixed input frequency, and displays a 3D image signal in N/k (k is a natural number less than N and greater than 1) subfields. And a driving control unit for converting and outputting image data, and a frame memory for storing 2D image data or 3D image data.

Description

Organic light emitting display device and its driving method {ORGANIC LIGHT EMITTING DISPLAY DEVICE AND METHODE OF DRIVING THE SAME}

The present invention relates to a display device, and more particularly, to an organic light emitting display device and a driving method thereof.

Conventional display devices display 2D images, but recently, research and development on display devices driven in a 2D image display mode and a 3D image display mode have been actively conducted. Also, in recent years, research on a digitally driven organic light emitting display device having a simple pixel circuit is being conducted. In the digital driving method, since the pixel represents only the on level and the off level, it is necessary to divide one frame into a plurality of subfields in order to represent gray levels. Gradation may be expressed by using a combination of on and off of light emission of the sub-field.

In general, an input driving frequency at which external image data is input to the driving control unit and an output driving frequency at which the driving control unit outputs image data are the same. In the case of driving in a 3D image display mode, since it is necessary to output the left eye image data and the right eye image data during one frame in order to prevent flicker of the image, the output driving frequency is set for the 2D image display mode. It should be doubled. Therefore, in the related art, the input driving frequency has to be doubled in order to drive the 3D image display mode, and accordingly, an input acceleration engine and a scaler having a complex logic are essentially arranged. Therefore, when driving in the 3D image display mode, there is a problem that power consumption increases and heat generation of the display device increases as the operation of the input acceleration engine and an increase in the input driving frequency are increased.

An object of the present invention is to provide an organic light emitting display device that displays a 2D image and a 3D image using a fixed input driving frequency.

Another object of the present invention is to provide a method of driving the organic light emitting display device.

However, the object of the present invention is not limited to the above-described objects, and may be variously extended without departing from the spirit and scope of the present invention.

In order to achieve an object of the present invention, an organic light emitting display device according to embodiments of the present invention includes a display panel including a plurality of pixels, a scan driver providing a scan signal to the display panel, 2D image data or 3D A data driver that generates a data signal for image data, provides the data signal to the display panel, receives a 2D image signal at a fixed input frequency, and transmits the 2D image signal to N (N is a natural number greater than 1). It converts and outputs N-bit 2D image data represented by) subfields, receives a 3D image signal at the fixed input frequency, and converts the 3D image signal to N/k (k is less than N). , A natural number greater than 1) a driving control unit for converting and outputting N/k-bit 3D image data represented by subfields, and a frame memory for storing the 2D image data or the 3D image data. I can.

According to an embodiment, the 2D image data may be generated by a first lookup table in which weights and on/off information of the N subfields corresponding to gray levels of the 2D image signal are set.

According to an embodiment, the 3D image data may be generated by a second lookup table in which weights and on/off information of the N/k subfields corresponding to the gray level of the 3D image signal are set.

According to an embodiment, a weight of the jth (j is a natural number of N/k or less) subfield of the 3D image data may be different from a weight of the jth subfield of the 2D image data.

In one embodiment, N may be an even number, and k may be 2.

According to an embodiment, the driving controller includes a memory controller that controls writing and reading of the 2D image data and the 3D image data to and from the frame memory, and the 2D image data or the frame read from the frame memory. A timing controller that transmits the 3D image data read from a memory to the data driver and controls the scan driver and the data driver.

According to an embodiment, the driving control unit receives the 2D image signal and the 3D image signal, and when driving in a 2D image display mode, inputs the 2D image signal to the first lookup table, When driven in the 3D image display mode, an image mode determination unit for inputting the 3D image signal to the second lookup table may be further included.

According to an embodiment, the memory controller includes a first write controller that writes the 2D image data to the frame memory, and a second write controller that writes the 3D image data to a first block and a second block of the frame memory, respectively. It may include a write controller and a read controller to read the 2D image data written in the frame memory.

According to an embodiment, the read controller may read the 3D image data written in the first block and the second block of the frame memory.

According to an embodiment, the memory controller includes a first write controller that writes the 2D image data to the frame memory, a second write controller that writes the 3D image data to the frame memory, and the frame memory. A first read controller for reading the 2D image data and a second read controller for repeatedly reading the 3D image data written in the frame memory twice.

According to an embodiment, the second lookup table may convert the 3D image signal into first 3D image data and second 3D image data represented by the N/2 subfields.

According to an embodiment, the first 3D image data and the second 3D image data may be identical to each other.

According to an embodiment, the memory controller includes a write controller for simultaneously writing the first 3D image data and the second 3D image data into the frame memory, and the first 3D image data written in the frame memory, and It may include a read controller that simultaneously reads the second 3D image data.

According to an embodiment, the write controller may write the 2D image data to the frame memory, and the read controller may read the 2D image data written to the frame memory.

According to an embodiment, the data signal may be applied to the display panel in a Progressive Emission with Simultaneous Scan (PESS) method.

In order to achieve an object of the present invention, a method of driving an organic light emitting display device according to embodiments of the present invention determines whether an image signal applied from an external device at a fixed input frequency is a 2D image signal or a 3D image signal. And, when the image signal is the 2D image signal, converts the 2D image signal into 2D image data represented by N subfields, and when the image signal is the 3D image signal, the 3 The dimensional image signal may be converted into 3D image data represented by N/2 subfields.

According to an embodiment, the 2D image data may be generated by a first lookup table in which weights and on/off information of the N subfields corresponding to gray levels of the 2D image signal are set.

According to an embodiment, the 3D image data may be generated by a second lookup table in which weights and on/off information of the N/2 subfields corresponding to the gray level of the 3D image signal are set.

According to an embodiment, a weight of the Kth (K is a natural number less than or equal to N/2) subfield of the 3D image data may be different from a weight of the Kth subfield of the 2D image data.

According to an embodiment, the conversion of the 3D image signal to the 3D image data includes writing the 3D image data to a first block and a second block of the frame memory, respectively, and the first block of the frame memory. The method may further include reading the 3D image data written in the first block and the second block to display a 3D image.

According to an embodiment, the conversion of the 2D image signal into the 2D image data includes writing the 2D image data into a frame memory and reading the 2D image data written in the frame memory to obtain a 2D image. It may further include displaying an image.

In the digitally driven organic light emitting display device and its driving method according to embodiments of the present invention, an image signal is received at a fixed input driving frequency, and the number of subfields of 3D image data is determined as subfields of 2D image data. It can be converted to correspond to half (or 1/3, 1/4) of the number of. Accordingly, when driving in the 3D image display mode, the output driving frequency of the driving control unit may increase substantially by an integer multiple with respect to the input driving frequency. In addition, since it is not necessary to increase or increase the input driving frequency in the 3D image display mode, power consumption may be reduced, and an input acceleration engine, a scaler, and the like may be removed. Furthermore, the configuration of the memory controller may be simplified according to the memory write/read method. Therefore, power consumption for the operation of the memory controller can be reduced.

However, the effects of the present invention are not limited to the above-described effects, and may be variously extended without departing from the spirit and scope of the present invention.

1 is a block diagram illustrating an organic light emitting display device according to example embodiments.
FIG. 2 is a diagram illustrating an example in which the organic light emitting diode display of FIG. 1 is digitally driven.
3 is a diagram illustrating an example of image data output from the organic light emitting display device of FIG. 1.
FIG. 4 is a diagram illustrating an example in which 2D image data generated by a first lookup table included in the organic light emitting diode display of FIG. 1 is stored in a frame memory.
5A is a block diagram illustrating an example of a driving control unit of the organic light emitting display device of FIG. 1.
5B is a diagram illustrating an example in which 3D image data is stored in a frame memory by an operation of the driving control unit of FIG. 5A.
6A is a block diagram illustrating another example of a driving control unit of the organic light emitting display device of FIG. 1.
6B is a diagram illustrating an example in which 3D image data is stored in a frame memory by an operation of the driving control unit of FIG. 6A.
7A is a block diagram illustrating another example of a driving control unit of the organic light emitting display device of FIG. 1.
7B is a diagram illustrating an example in which 3D image data is stored in a frame memory by an operation of the driving control unit of FIG. 7A.
8 is a flowchart illustrating a method of driving an organic light emitting diode display according to example embodiments.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings. The same reference numerals are used for the same elements in the drawings, and duplicate descriptions for the same elements are omitted.

1 is a block diagram illustrating an organic light emitting display device according to example embodiments.

Referring to FIG. 1, an organic light emitting display device 100 may include a display panel 110, a scan driver 120, a data driver 130, a driving controller 140, and a frame memory 150. The organic light emitting display device 100 may be driven by dividing the frame into a plurality of subfields. In an embodiment, the organic light emitting display device 100 may be driven in a digital manner in which a data signal is applied to the display panel 110 in a progressive emission with simultaneous scan (PESS) method.

The display panel 110 includes a plurality of scan lines SL1, ..., SLn, a plurality of data lines DL1, ..., DLm, and the gate lines SL1,. .., SLn) and a plurality of pixels (not shown) electrically connected to each of the data lines DL1, ..., DLm. The pixels may express gray levels using a combination of on and off of light emission of a plurality of subfields.

The scan driver 120 may provide a scan signal to the pixel circuits through a plurality of scan lines SL1, ..., SLn. The scan driver 120 generates scan signals for driving the scan lines SL1, ..., SLn in response to the first control signal CNT1 received from the timing controller 140. The scan driver 140 may output the scan signals to the scan lines SL1, ..., SLn in a preset order.

The data driver 130 may provide a data signal to the pixels through a plurality of data lines DL1, ..., DLm. The data driver 130 may input the second control signal CNT2 and the pixel data RGB DATA from the timing controller 140. The data driver 130 may generate a data signal based on the pixel data RGB DATA and output the data signal to the data lines DL1, ..., DLm.

The driving control unit 140 may receive a 2D image signal 2DS or a 3D image signal 3DS at a constant (fixed) input frequency. For example, a 2D image signal 2DS and/or a 3D image signal 3DS may be received at an input frequency of 120 Hz. That is, even when the image display mode of the organic light emitting diode display 100 is changed, image signals may be received from an external device at the same frequency.

The driving control unit 140 receives the 2D image signal 2DS at a fixed input frequency, and converts the 2D image signal 2DS into N (N is a natural number greater than 1) of N-bits. Converts to 2D image data (DATA1) and outputs, receives a 3D image signal (3DS) at the fixed input frequency, and transmits the 3D image signal to N/k (k is a natural number less than N and greater than 1). It may be converted into N/2-bit 3D image data DATA2 represented by subfields and then output. In one embodiment, k is set to a factor of N. When K is set to 2, the driving control unit 140 outputs 2D image data DATA1 corresponding to one frame section and 3D image data DATA2 corresponding to 1/2 frame section. I can. Accordingly, 3D image data DATA2 that is twice as large as the 2D image data DATA1 may be output during one frame period. That is, the output driving frequency in the 3D image display mode may be twice the output driving frequency in the 2D image display mode. However, the number of subfields of the 3D image data DATA2 is not limited thereto. For example, the 3D image data DATA2 may include the number of subfields corresponding to a 1/3 frame period or a 1/4 frame period. In this case, the output driving frequency can be increased three times or four times, respectively.

The driving control unit 140 receives a 2D image signal 2DS or a 3D image signal 3DS from an external device (for example, a host device) and uses the data driver 130 and the scan driver 120 to use the data driver ( 130) and control signals CLT1 and CLT2 required for the operation of the scan driver 120 and image data RGB DATA may be provided. The driving control unit 140 may include a first lookup table 142, a second lookup table 144, a memory controller 146, and a timing controller 148. The driving control unit 140 may further include an image mode determination unit.

The first lookup table 142 may include weights and on/off information of N subfields corresponding to gray levels of the 2D image signal 2SD. The 2D image signal 2SD of one frame may be converted into 2D image data DATA1 having N subfield information through the first lookup table 142. For example, when one frame is set to 8 subfields and 2D image data DATA1 is set to 8 bits, each bit indicates whether or not to emit light for each subfield. The weight of the sub-field determines the time when the pixel emits light in the sub-field.

The second lookup table 144 may include weights and on/off information of N/k subfields corresponding to gray levels of the 3D image signal 3DS. In an embodiment, the second lookup table 144 may include weights and on/off information of N/2 subfields corresponding to gray levels of the 3D image signal 3DS. Accordingly, the 3D image signal 3SD of one frame may be converted into 3D image data DATA2 having N/2 subfield information through the second lookup table 144. That is, when one frame is set to eight subfields, the 3D image data DATA2 includes four subfields and may be set to four bits. The 3D image data DATA2 may correspond to left-eye image data or right-eye image data.

In an embodiment, the total light emission time of a pixel based on the 3D image data DATA2 may correspond to half of the total light emission time of the pixel based on the 2D image data DATA1. Accordingly, an image of two 3D image data DATA2 (ie, left-eye image data and right-eye image data) may be displayed on the display panel 110 during one frame period.

The weight of the jth (j is a natural number less than or equal to N/k) subfield of the 3D image data DATA2 may be set to be different from the weight of the jth subfield of the 2D image data DATA1. For example, the emission time of the first subfield of the 3D image data DATA2 may be different from the emission time of the first subfield of the 2D image data DATA1.

The memory controller 146 controls the overall operation of the frame memory 150, and in particular, may control an address and a timing at which a write operation and a read operation are performed in the frame memory 150. The memory controller 146 may perform a write operation and a read operation in various ways according to the subfields representing the 3D image data DATA2.

The timing controller 148 transfers pixel data (RGB DATA) read from the frame memory 150 (that is, the 2D image data or the 3D image data read from the frame memory 150) to the data driver 130. It transmits, and it is possible to control the scan driver 120 and the data driver 130.

The timing controller 148 may generate a first control signal CNT1 that controls the scan driver 120 and apply it to the scan driver 120. Also, the timing controller 148 may generate a second control signal CNT2 that controls the data driver 130 and apply it to the data driver 130.

The frame memory 150 may store 2D image data DATA1 or 3D image data DATA2 to be provided to the data driver 130. In an embodiment, the frame memory 150 may include a memory for storing 2D image data DATA1, a memory for storing the left-eye image data, and a memory for storing the right-eye image data, respectively.

As described above, the digitally driven organic light emitting display device 100 according to embodiments of the present invention receives an image signal at a fixed input driving frequency, and determines the number of subfields of the 3D image data as a 2D image. It can be converted to correspond to half (or 1/3, 1/4) of the number of subfields of data. Accordingly, when driving in the 3D image display mode, the output driving frequency of the driving control unit 140 substantially increases by 2 times (or 3 times or 4 times) with respect to the input driving frequency. In addition, since it is not necessary to increase or increase the input driving frequency in the 3D image display mode, power consumption may be reduced, and an input acceleration engine, a scaler, and the like may be removed.

FIG. 2 is a diagram illustrating an example in which the organic light emitting diode display of FIG. 1 is digitally driven.

Referring to FIGS. 1 and 2, the organic light emitting display device 100 may be driven in a progressive emission with simultaneous scan (PESS) method.

One frame period may be divided into a plurality of subfields and driven. FIG. 2 illustrates that one frame section is divided into five subfields SF1, SF2, SF3, SF4, and SF5 including one blank subfield SF5 and driven. However, the number of subfields constituting one frame period may be variously determined according to a required condition. Furthermore, the blank sub-field SF5 may be omitted within one frame period.

The length information of each of the subfields 1, 2, 3, 4, and 5 constituting one frame section means an emission time. In this case, the emission time is set differently for each of the subfields 1, 2, 3, 4, and 5, and the emission time may represent each bit. In an embodiment, the light emission time of the sub-fields 1, 2, 3, and 4 excluding the blank sub-field 5 may be increased at a rate of 2^n. For example, the emission time of the second sub-field 2 is twice the emission time of the first sub-field 1, and the emission time of the third sub-field 3 is the emission time of the second sub-field 2 Is twice, and the emission time of the fourth sub-field 4 may be twice that of the third sub-field 3. However, this is exemplary, and the increase rate of the light emission time is not limited thereto.

In this case, the fourth sub-field 4 having the longest emission time may correspond to the most significant bits (MSB) of the data signal, and the first sub-field 1 having the shortest emission time is data It may correspond to the least significant bits (LSB) of the signal. As a result, the digital driving method can express a predetermined gray level based on the sum of the emission times EM of the subfields 1, 2, 3, 4, and 5 constituting one frame.

As shown in FIG. 2, the digital driving method of the simultaneous scan sequential light emission method is a subfield scan of scan lines arranged in a constant subfield emission order (for example, in the order of 1-2-3-4-5) By shifting the timing by a predetermined time, scan lines are randomly scanned, and subfields 1, 2, 3, 4, and 5 of the scanned scan lines are respectively emitted.

3 is a diagram illustrating an example of image data output from the organic light emitting display device of FIG. 1.

1 to 3, the driving control unit 140 of the organic light emitting display device 100 may generate 2D image data DATA1 and/or 3D image data DATA2.

The 2D image data DATA1 may include N subfields. For example, as illustrated in FIG. 3, the 2D image data DATA1 includes 8 subfields, and one frame section may be divided into 8 subfields and driven.

In an embodiment, the 3D image data DATA2 may include N/2 subfields. For example, as illustrated in FIG. 3, the 3D image data DATA2 includes 4 subfields, and the 4 subfields may be divided and driven during a 1/2 frame period. Accordingly, during one frame period, the driving control unit may output two 3D image data. The two 3D image data may correspond to left-eye image data and right-eye image data, respectively. However, the number of subfields of the 3D image data DATA2 is not limited thereto.

In one embodiment, the weight of the jth subfield of the 3D image data DATA2 (j is a natural number less than or equal to N/2) is set to be different from the weight of the jth subfield of the 2D image data DATA1. I can.

FIG. 4 is a diagram illustrating an example in which 2D image data generated by a first lookup table included in the organic light emitting diode display of FIG. 1 is stored in a frame memory.

1 to 4, the driving control unit 140 of the organic light emitting display device 100 includes a first lookup table 142 for converting a 2D image signal 2DS into 2D image data DATA1. can do. The first lookup table 142 may include weights and on/off information of the eight subfields SF1, SF2, and SF8 corresponding to the gray level of the 2D image signal 2DS. For example, the first lookup table 142 may be configured as shown in [Table 1] below.

However, this is exemplary, and grayscale, the number of subfields, and on/off information are not limited thereto.

[Table 1]

As shown in [Table 1], one frame section may be divided into eight sub-fields SF1, SF2, and SF8 and driven. In an embodiment, if the gradation to be expressed on the display panel 110 is 256, the 2D image data DATA1 may be set to 8 bits. Each bit may indicate whether or not to emit light for each subfield. When the bit of the first sub-field SF1 is set to 1, the first sub-field SF1 is set to emit light (on), and when the bit of the first sub-field SF1 is set to 0, the first The sub-field SF1 may be set to non-emission (off). For example, when the 2D image signal 2DS has 182 gray scales, the 2D image signal 2DS may be converted into 2D image data DATA1 of 10110110 by the first lookup table 142.

As illustrated in FIG. 4, the 2D image data DATA1 may be stored in the frame memory 150 by a write operation of the memory controller 146. 4 shows a frame memory map when 2D image data DATA1 is stored in the frame memory 150 at a predetermined time point.

The frame memory 150 may store light emission information and address information of each of the first to eighth subfields SF1, SF2, and SF8 of the 2D image data DATA1. The address information may include first location information and second location information. The first location information ROW may mean line information corresponding to a scan line of the display panel 110. The second location information may mean column line information corresponding to data lines of the display panel 110. The emission information may mean on/off information for each subfield.

The memory controller 146 includes a write controller that writes the 2D image data DATA1 generated by the first lookup table 142 into the frame memory 150 and the 2D image data DATA1 written in the frame memory 150. ) May include a read controller for reading. The read controller may read the 2D image data DATA1 written in the frame memory 150 to display the 2D image. In one embodiment, the 2D image data DATA1 read by the read controller is converted into pixel data (RGB DATA) having 8 subfields corresponding to one frame section and provided to the display panel 110. I can.

5A is a block diagram illustrating an example of a driving control unit of the organic light emitting display device of FIG. 1, and FIG. 5B is a diagram illustrating an example in which 3D image data is stored in a frame memory by an operation of the driving control unit of FIG. 5A.

1 to 5B, the driving control unit 240 includes a determination unit 141, a first lookup table 242, a second lookup table 244, a memory controller 246, and a timing controller 148. can do. The driving control unit may further include an image processor 147. The 3D image data DATA2 may be stored in the first block BLOCK1 and the second block BLOCK2 of the frame memory 150, respectively.

The determination unit 141 may receive a 2D image signal 2DS and a 3D image signal 3DS generated by an external device. When the organic light emitting display device is driven in a 2D image display mode, the external device may output a 2D image signal 2DS. The determination unit 141 may receive the 2D image signal 2DS and provide the 2D image signal 2DS to the first lookup table 242. In addition, when the organic light emitting display device 100 is driven in a 3D image display mode, the external device may output a 3D image signal 3DS. The determination unit 141 may receive the 3D image signal 3DS and provide the 3D image signal 3DS to the second lookup table 244.

When the organic light emitting diode display 100 is driven in the 2D image display mode, the 2D image signal 2SD is N-bit 2D image data represented by N subfields by the first lookup table 242 It can be converted to (DATA1). For example, as shown in [Table 1], the 2D image data DATA1 may be set to 8 bits, and may include first to eighth subfields.

When the organic light emitting diode display 100 is driven in the 3D image display mode, in an embodiment, the 3D image signal 3SD is represented by N/2 subfields by the second lookup table 244. It may be converted into N/2-bit 3D image data DATA2. In an embodiment, when the 2D image data DATA1 is represented by 8 subfields, the second lookup table 244 includes 4 subfields SF1 corresponding to the gray level of the 3D image signal 3DS. , SF2, SF3, SF4) and on/off information. For example, the second lookup table 244 may be configured as shown in Table 2 below. That is, the 3D image data DATA2 may be set to 4 bits and may include first to fourth subfields.

[Table 2]

However, this is exemplary, and grayscale, the number of subfields, and on/off information are not limited thereto.

One frame period may be divided into four subfields and driven. Accordingly, the total emission time that the pixels emit light by the 3D image data DATA2 may correspond to a half frame period. In an embodiment, the 3D image data DATA2 may correspond to left-eye image data or right-eye image data of one frame.

Since the number of subfields of the 3D image data DATA2 generated by the second lookup table 244 corresponds to 1/2 of the subfields of the 2D image data DATA1, 2 The dimensional image data DATA2 may be output from the driving control unit 240. Accordingly, in order to display a 3D image, a 3D image can be displayed without increasing an input frequency for image signals input to the driving control unit 140.

The memory controller 246 may include a first write controller 22, a second write controller 24, and a read controller 26.

The first write controller 22 may write the 2D image data DATA1 to the frame memory 150. The first write controller 22 may control a write operation of the 2D image data DATA1. For example, the first write controller 22 may control a timing at which the 2D image data DATA1 is written to the frame memory 150 and a write clock. Also, the first write controller 22 may provide address information to be written to the frame memory 150. Accordingly, the 2D image data DATA1 may be written to the frame memory 150 according to the address information.

4, the frame memory 150 stores light emission information and address information for each of the first to eighth subfields SF1, SF2, and SF8 through the operation of the first write controller 22. Can be saved.

As shown in FIG. 5B, the second write controller 24 may write 3D image data DATA2 to the first block BLOCK1 and the second block BLOCK2 of the frame memory 150, respectively. 5B shows a frame memory map when 3D image data DATA2 is stored in the frame memory 150 at a predetermined time point. The second write controller 24 may repeatedly write the 3D image data DATA2 to the frame memory 150 twice. The 3D image data DATA2 may have half subfields of the 2D image data DATA1. Therefore, when the 3D image data DATA2 is written to the frame memory 150 once, the 3D image data DATA2 may be stored only in the first block BLOCK1 of the frame memory 150. When the 3D image data DATA2 is written to the frame memory 150 twice, the 3D image data DATA2 will be stored in the first block BLOCK1 and the second block BLOCK2 of the frame memory 150. I can. The second block BLOCK2 may correspond to an area of the frame memory 150 in which information on the fifth to eighth subfields of the 2D image data DATA1 is stored. Therefore, as illustrated in FIG. 5B, the 3D image data DATA2 may be stored in the first block BLOCK1 and the second block BLOCK2 of the frame memory 150, respectively.

The read controller 26 may read the 2D image data DATA1 written in the frame memory 150. The read controller 26 may display the 2D image by reading 2D image data DATA1 including 8 subfields.

In an embodiment, the read controller 26 may read 3D image data DATA2 written in the first block BLOCK1 and the second block BLOCK2 of the frame memory 150. Since the two 3D image data DATA2 are written, the read controller 26 used to read the 2D image data DATA1 having N surf fields is the 3D image data written to the frame memory 150 (DATA2) can be read. Therefore, it is not necessary to add a separate read controller used for displaying a 3D image.

The driving control unit 240 may further include an image processor (not shown). The image processor converts image data (i.e., 2D image data or 3D image data) read from the frame memory 120 into pixel data (RGB DATA) having a value suitable for the environment of the display panel 110, and the timing controller It can be sent to (248). For example, the image processor generates 2D image data in units of frames based on the read 2D image data DATA1, or generates 2D image data in units of 1/2 frame based on the read 3D image data DATA2. Left-eye image data and/or right-eye image data in a 1/2 frame unit may be generated.

The timing controller 148 may provide the first control signal CNT1 to the scan driver 120, and provide the pixel data RGB DATA and the second control signal CNT2 to the data driver 130.

5B, the frame memory 150 may store light emission information and address information of each of the first to fourth subfields SF1, SF2, SF3, and SF4 of the 3D image data DATA2. have. The address information may include first location information and second location information. The emission information may mean on/off information for each subfield. The first location information may mean row line information corresponding to the scan line of the display panel 110. The second location information may mean column line information corresponding to data lines of the display panel 110.

As described above, the organic light emitting display device 100 according to the present invention receives an image signal at a fixed input driving frequency, and the number of subfields of 3D image data is equal to half of the number of subfields of 2D image data. It can be converted to correspond. In the case of driving in the 3D image display mode, the output driving frequency is substantially doubled with respect to the input driving frequency. In addition, since it is not necessary to increase the input driving frequency for providing the 3D image signal 3DS to the driving control unit 140, power consumption may be reduced. In addition, there is an advantage that one read controller 26 can control both the reading operation of the 2D image data DATA1 and the 3D image data DATA2.

6A is a block diagram illustrating another example of a driving control unit of the organic light emitting display device of FIG. 1, and FIG. 6B is a diagram illustrating an example in which 3D image data is stored in a frame memory by an operation of the driving control unit of FIG. 6A.

1 to 4, 6A and 6B, the driving control unit 340 includes a determination unit 141, a first lookup table 342, a second lookup table 344, a memory controller 346, and a timing. A controller 148 may be included. The driving control unit may further include an image processor. The 3D image data DATA2 may be stored in the first block BLOCK1 of the frame memory 150.

Since the driving control unit 340 according to the present embodiment is the same as the driving control unit 240 of FIG. 5A except for the configuration of the memory controller 340, the same reference numbers are used for the same or corresponding components, and overlapping components are used. Description is omitted.

The determination unit 141 may receive the 2D image signal 2DS and provide the 2D image signal 2DS to the first lookup table 242. The determination unit 141 may receive the 3D image signal 3DS and provide the 3D image signal 3DS to the second lookup table 244.

It will be described that the first lookup table 342 is applied to the lookup table of [Table 1], and the second lookup table 344 is applied to the lookup table of [Table 2].

The memory controller 346 may include a first write controller 32, a first read controller 34, a second write controller 36, and a second read controller 38.

The first write controller 32 may write the 2D image data DATA1 to the frame memory 250. The first write controller 22 may control a write operation of the 2D image data DATA1. The first read controller 34 may read the 2D image data DATA1 written in the frame memory 150. The operation of the driving control unit 340 in the 2D image display mode has been described above with reference to FIGS. 1 to 4, and a detailed description thereof will be omitted.

As shown in FIG. 6B, the second write controller 36 may write 3D image data DATA2 to the first block BLOCK1 of the frame memory 150. 6B shows a frame memory map when 3D image data DATA2 is stored in the frame memory 250 at a predetermined time point. The second write controller 24 may write the 3D image data DATA2 to the frame memory 150. The 3D image data DATA2 may have half subfields of the 2D image data DATA1. Therefore, when the 3D image data DATA2 is written to the frame memory 150 once, the 3D image data DATA2 may be stored in the first block BLOCK1 of the frame memory 150. For example, 4 bits of 3D image data DATA2 are stored in the frame memory 150.

The second read controller 38 may repeatedly read the 3D image data DATA2 written in the frame memory 250 twice. Accordingly, the 3D image data DATA2 in the same form as the data format in which the 2D image data DATA1 is read from the frame memory 250 may be read. In an embodiment, the image processing unit may convert 2D image data DATA1 or 3D image data DATA2 of the same size into pixel data RGB DATA.

As described above, since the number of subfields of the 3D image data DATA2 corresponds to half of the number of subfields of the 2D image data DATA1, the driving control unit ( 140) has an effect that the output driving frequency is substantially doubled. In addition, since the size of the 3D image data DATA2 written to the frame memory 250 in one frame period corresponds to half of the 2D image data DATA1, power consumption required to control the frame memory 250 is improved. Can be.

7A is a block diagram illustrating another example of a driving control unit of the organic light emitting display device of FIG. 1, and FIG. 7B is a diagram illustrating an example in which 3D image data is stored in a frame memory by an operation of the driving control unit of FIG. 7A .

1 to 4, 7A and 7B, the driving control unit 440 includes a determination unit 141, a first lookup table 442, a second lookup table 444, a memory controller 446, and a timing. A controller 148 may be included. The driving control unit 440 may further include an image processor (not shown).

The driving control unit 340 according to the present embodiment is the same as the driving control unit 240 of FIG. 5A except for the configurations of the second look-up table 444 and the memory controller 340, so that the same or corresponding components are the same. Reference numerals are used, and duplicate descriptions are omitted. Also, the lookup table of [Table 1] may be applied to the first lookup table 342.

The write controller 42 may write the 2D image data DATA1 to the frame memory 250. The first write controller 22 may control a write operation of the 2D image data DATA1. The read controller 44 may read the 2D image data DATA1 written in the frame memory 150. The operation of the driving control unit 440 in the 2D image display mode has been described above with reference to FIGS. 1 to 3, and a detailed description thereof will be omitted.

The second lookup table 444 may convert the 3D image signal 3DS into first 3D image data DATA2 and second 3D image data DATA3 represented by N/2 subfields. In an embodiment, the first 3D image data DATA2 and the second 3D image data DATA3 are identical to each other. In an embodiment, when the 2D image data DATA1 is represented by 8 subfields, the second lookup table 444 includes 4 subfields SF1 corresponding to gray levels of the 3D image signal 3DS. , SF2, SF3, SF4) and on/off information. For example, the second lookup table 444 may be configured as shown in Table 3 below. That is, the first 3D image data DATA2 and the second 3D image data DATA3 may each include first to fourth subfields.

[Table 3]

However, this is exemplary, and grayscale, the number of subfields, and on/off information are not limited thereto.

One frame period may be divided into four subfields and driven. The total light emission time that the pixel emits light by the first 3D image data DATA2 or the second 3D image data DATA3 may correspond to a 1/2 frame period. Accordingly, the 3D image data DATA2 may correspond to left-eye image data or right-eye image data in one frame section. Accordingly, the first 3D image data DATA2 (or the second 3D image data DATA3) may correspond to the left eye image data or the right eye image data.

Since the number of subfields of the first 3D image data DATA2 and the second 3D image data DATA3 corresponds to 1/2 of the subfields of the 2D image data DATA1, the left eye image is Data and right eye image data may be output from the driving control unit 240.

The memory controller 446 may include a write controller 42 and a read controller 44. The write controller 42 may be a common write controller that controls writing of the 2D image data DATA1 and the writing of the 3D image data DATA2 and DATA3. The read controller 44 may be a common read controller that controls reading of the 2D image data DATA1 and reading of the 3D image data DATA2 and DATA3.

As shown in FIG. 7B, the write controller 42 writes the first 3D image data DATA2 to the first block BLOCK1 of the frame memory 150, and writes the second 3D image data DATA3. The second block BLOCK2 of the frame memory 150 may be written. The frame memory map of FIG. 6B may be substantially the same as the frame memory map of FIG. 5B. Since the 3D image signal 3DS is converted into two 3D image data DATA2 and DATA3 by the second lookup table 444, it is used for writing the 2D image data DATA1 having N subfields. The write controller 42 may write the 3D image data DATA2 and DATA3 to the frame memory 150. Therefore, it is not necessary to add a write controller used for displaying a 3D image.

The read controller 44 reads the first 3D image data DATA2 and the second 3D image data DATA3 written in the first block BLOCK1 and the second block BLOCK2 of the frame memory 150. I can. Since the two 3D image data DATA2 and DATA3 are written, the read controller 44 used to read the 2D image data DATA1 is the first and second 3D image data written in the frame memory 150 The fields (DATA2, DATA3) can be read. Therefore, it is not necessary to add a write controller used for 3D image display. The read 3D data DATA2 and DATA3 are converted into pixel data RGB DATA having a value suitable for the environment of the display panel 110, and a 3D image may be displayed on the display panel 110.

The frame memory map of FIG. 7B has been described above with reference to FIG. 5B, and a detailed description thereof will be omitted.

As described above, since the number of subfields of the 3D image data DATA2 corresponds to half of the number of subfields of the 2D image data DATA1, the driving control unit for the input driving frequency when driving in the 3D image display mode It has an effect that the output driving frequency of 440 is substantially doubled. In addition, since it is not necessary to increase or increase the input driving frequency in the 3D image display mode, power consumption may be reduced, and an input acceleration engine, a scaler, and the like may be removed. Furthermore, since two-dimensional and three-dimensional images can be displayed using one write controller 42 and one read controller 44, the configuration of the memory controller 446 can be simplified.

8 is a flowchart illustrating a method of driving an organic light emitting diode display according to example embodiments.

Referring to FIG. 8, the driving method of an organic light emitting display device that divides a frame into a plurality of subfields and drives it is determined whether an image signal applied from an external device at a fixed input frequency is a 2D image signal or a 3D image signal. (S110), and when the image signal is a 2D image signal, the 2D image signal is converted into 2D image data represented by N subfields (S120), and the image signal is the 3D image signal In this case, the 3D image signal may be converted into 3D image data represented by N/2 subfields (S130). In an embodiment, the organic light emitting display device may be driven in a simultaneous scan sequential light emission (PESS) method.

Specifically, it may be determined whether an image signal applied from an external device at a fixed input frequency is a 2D image signal or a 3D image signal (S110). When the organic light emitting display device is driven in a 2D image display mode, the external device may output a 2D image signal. In an embodiment, the 2D image signal may be provided to a first lookup table included in a driving control unit. On the other hand, when the organic light emitting display device is driven in a 3D image display mode, the external device may output a 3D image signal. In an embodiment, the 3D image signal may be provided to a second lookup table included in the driving control unit.

When the image signal is a 2D image signal, the 2D image signal may be converted into 2D image data represented by N subfields (S120). In an embodiment, the 2D image data may be generated by the first lookup table in which weights and on/off information of the N subfields corresponding to the gray level of the 2D image signal are set. For example, the 2D image data may be set to 8 bits, and may include first to eighth subfields.

The 2D image data may be written in the frame memory (S140). In an embodiment, the 2D image data may be stored in the frame memory by a write operation of a memory controller. The memory controller includes a first write controller to write the 2D image data generated by the first lookup table to the frame memory, and a read controller to read the 2D image data written to the frame memory. I can.

The 2D image data written in the frame memory may be read and a 2D image may be displayed (S160). The 2D image data read by the read controller may be converted into N-bit pixel data corresponding to one frame section to display a 2D image. For example, the 2D image data may be converted into 8-bit pixel data corresponding to one frame section to display a 2D image. However, a method of displaying a 2D image by the organic light emitting display device has been described above with reference to FIGS. 1 to 4, and a detailed description thereof will be omitted.

When the image signal is the 3D image signal, the 3D image signal may be converted into 3D image data represented by N/2 subfields (S130). In an embodiment, the 3D image data may be generated by the second lookup table in which the weights and on/off information of the N/2 subfields corresponding to the gray level of the 3D image signal are set. For example, when the 2D image data includes first to eighth subfields, the 3D image data may be set to 4 bits and may include first to fourth subfields.

In an embodiment, the weight of the jth (j is a natural number less than or equal to N/2) subfield of the 3D image data may be set differently from the weight of the jth subfield of the 2D image data.

The 3D image data may be written (S150) to a first block and a second block of the frame memory, respectively. The memory controller may include a second write controller that writes the 3D image data generated by the second lookup table to the first block and the second block of the frame memory. The second write controller may repeatedly write the 3D image data to the frame memory twice. The 3D image data may have half subfields of the 2D image data. Therefore, the 3D image data may be stored in the first block and the second block of the frame memory, respectively.

The 3D image data written in the first block and the second block of the frame memory may be read and a 3D image may be displayed (S170). Since two N/2-bit 3D image data are written to the frame memory, the read controller used to read N-bit 2D image data can read the 3D image data written in the frame memory. . Therefore, there is no need for a separate read controller used for displaying a 3D image. In an embodiment, left eye image data of a 1/2 frame section and/or right eye image data of a 1/2 frame section may be generated based on the read 3D image data. Accordingly, a 3D image may be displayed on the display panel. However, this is exemplary, and the operation of writing and reading 3D image data to the frame memory is not limited thereto. In addition, a method of displaying a 3D image by the OLED display has been described above with reference to FIGS. 1 to 3 and 5A to 7B, and a detailed description thereof will be omitted.

As described above, in the driving method of the organic light emitting diode display according to the exemplary embodiments of the present invention, the number of subfields of the dimensional image data may be converted to correspond to half of the number of subfields of the 2D image data. Accordingly, In the case of driving in the 3D image display mode, the output driving frequency of the driving control unit 140 substantially doubles with respect to the input driving frequency. In addition, since it is not necessary to increase or increase the input driving frequency in the 3D image display mode, power consumption may be reduced, and an input acceleration engine, a scaler, and the like may be removed.

The present invention can be variously applied to an electronic device having a display device. For example, the present invention relates to a computer, a laptop computer, a digital camera, a video camcorder, a mobile phone, a smart phone, a smart pad, a PMP, a PDA, an MP3 player, a vehicle navigation system, a video phone, a surveillance system, a tracking system, It can be applied to motion detection systems, image stabilization systems, and the like.

Although the above has been described with reference to embodiments of the present invention, those skilled in the art will be able to variously modify and change the present invention within the scope not departing from the spirit and scope of the present invention described in the following claims. You will understand that you can.

100: organic light emitting display device 110: display panel
120: scan driving unit 130: data driving unit
140, 240, 340, 440: drive control unit 150: frame memory
142, 242, 342, 442: first lookup table
144, 244, 344, 444: second lookup table
146, 246, 346, 446: memory controller 148: timing controller

Claims (20)

In the organic light emitting display device for driving by dividing a frame into a plurality of subfields,
A display panel including a plurality of pixels;
A scan driver providing a scan signal to the display panel;
A data driver generating a data signal for 2D image data or 3D image data and providing the data signal to the display panel;
Receives a 2D image signal at a fixed input frequency, converts the 2D image signal into 2D image data represented by N (N is a natural number greater than 1) subfields, and outputs the fixed input frequency A driving control unit for receiving a 3D image signal and converting the 3D image signal into 3D image data represented by N/k (k is a natural number less than N and greater than 1) subfields, and outputting the converted 3D image data; And
And a frame memory for storing the 2D image data or the 3D image data,
The 2D image data is generated by a first lookup table in which weights and on/off information of the N subfields corresponding to the gray level of the 2D image signal are set,
The 3D image data is generated by a second lookup table in which weights and on/off information of the N/k subfields corresponding to the gray level of the 3D image signal are set,
The weight of the jth subfield of the 3D image data (j is a natural number less than or equal to N/k) is different from the weight of the jth subfield of the 2D image data,
The emission time of the j-th sub-field of the 3D image data is different from the emission time of the j-th sub-field of the 2D image data,
The organic light emitting display device, wherein the input frequency of the 2D image signal and the input frequency of the 3D image signal are the same. delete delete delete The organic light-emitting display device of claim 1, wherein N is an even number and k is 2. The method of claim 1, wherein the driving control unit,
A memory controller controlling writing and reading of the 2D image data and the 3D image data to the frame memory; And
And a timing controller that transmits the 2D image data read from the frame memory or the 3D image data read from the frame memory to the data driver, and controls the scan driver and the data driver. Organic light-emitting display device. The method of claim 6, wherein the driving control unit,
When receiving the 2D image signal and the 3D image signal and driving in a 2D image display mode, inputting the 2D image signal into the first lookup table and driving in a 3D image display mode, And an image mode determining unit configured to input the 3D image signal to the second lookup table. The method of claim 6, wherein the memory controller,
A first write controller for writing the 2D image data to the frame memory;
A second write controller for writing the 3D image data to a first block and a second block of the frame memory, respectively; And
And a read controller to read the 2D image data written in the frame memory. The organic light emitting diode display of claim 8, wherein the read controller reads the 3D image data written in the first block and the second block of the frame memory. The method of claim 6, wherein the memory controller,
A first write controller for writing the 2D image data to the frame memory;
A second write controller for writing the 3D image data to the frame memory;
A first read controller to read the 2D image data written in the frame memory; And
And a second read controller configured to repeatedly read the 3D image data written in the frame memory twice. The method of claim 6, wherein the second lookup table is
And converting the 3D image signal into first 3D image data represented by N/2 subfields and second 3D image data represented by the N/2 subfields. The organic light emitting diode display of claim 11, wherein the first 3D image data and the second 3D image data are identical to each other. The method of claim 12, wherein the memory controller,
A write controller that simultaneously writes the first 3D image data and the second 3D image data to the frame memory; And
And a read controller for simultaneously reading the first 3D image data and the second 3D image data written in the frame memory. The method of claim 13, wherein the write controller writes the 2D image data to the frame memory,
The read controller reads the 2D image data written in the frame memory. The organic light emitting diode display of claim 1, wherein the data signal is applied to the display panel in a progressive emission with simultaneous scan (PESS) method. In the driving method of an organic light emitting display device for driving by dividing a frame into a plurality of subfields,
Determining whether an image signal applied from an external device at a fixed input frequency is a 2D image signal or a 3D image signal;
Converting the 2D image signal into 2D image data represented by N subfields when the image signal is the 2D image signal; And
When the image signal is the 3D image signal, converting the 3D image signal into 3D image data represented by N/2 subfields,
The 2D image data is generated by a first lookup table in which weights and on/off information of the N subfields corresponding to the gray level of the 2D image signal are set,
The 3D image data is generated by a second lookup table in which weights and on/off information of the N/2 subfields corresponding to the gray level of the 3D image signal are set,
The weight of the jth subfield of the 3D image data (j is a natural number less than or equal to N/2) is different from the weight of the jth subfield of the 2D image data,
The emission time of the j-th sub-field of the 3D image data is different from the emission time of the j-th sub-field of the 2D image data,
The driving method of an organic light emitting diode display, wherein the input frequency of the 2D image signal and the input frequency of the 3D image signal are the same. delete delete The method of claim 16, wherein converting the 3D image signal into the 3D image data comprises:
Writing the 3D image data to a first block and a second block of a frame memory, respectively;
And displaying a 3D image by reading the 3D image data written in the first block and the second block of the frame memory. The method of claim 16, wherein converting the 2D image signal into the 2D image data comprises:
Writing the 2D image data to a frame memory;
And displaying a 2D image by reading the 2D image data written in the frame memory.

Images